The 2012 Superman movie from Christopher Nolan and Zack Snyder heats up as casting rumors abound! Kevin Costner is up for the role of Jonathan Kent, while Viggo Mortensen is up for the role of General Zod...or Lex Luthor? Are Henry Cavill, Kevin Costner and Viggo Mortensen Zack Snyder's dream team? And who will be cast as Lois Lane or Ursa?